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virtualx-engine/thirdparty/astcenc/astcenc_entry.cpp
Rémi Verschelde 5a3f955e05
astcenc: Update to 4.4.0 
> The 4.4.0 release is a minor release with image quality improvements,
> a small performance boost, a few new quality-of-life features, and a
> few minor fixes for uncommon build configurations.

https://github.com/ARM-software/astc-encoder/releases/tag/4.4.0
2023-05-11 14:32:47 +02:00

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// SPDX-License-Identifier: Apache-2.0
// ----------------------------------------------------------------------------
// Copyright 2011-2023 Arm Limited
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at:
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.
// ----------------------------------------------------------------------------
/**
* @brief Functions for the library entrypoint.
*/
#include <array>
#include <cstring>
#include <new>
#include "astcenc.h"
#include "astcenc_internal_entry.h"
#include "astcenc_diagnostic_trace.h"
/**
* @brief Record of the quality tuning parameter values.
*
* See the @c astcenc_config structure for detailed parameter documentation.
*
* Note that the mse_overshoot entries are scaling factors relative to the base MSE to hit db_limit.
* A 20% overshoot is harder to hit for a higher base db_limit, so we may actually use lower ratios
* for the more through search presets because the underlying db_limit is so much higher.
*/
struct astcenc_preset_config
{
float quality;
unsigned int tune_partition_count_limit;
unsigned int tune_2partition_index_limit;
unsigned int tune_3partition_index_limit;
unsigned int tune_4partition_index_limit;
unsigned int tune_block_mode_limit;
unsigned int tune_refinement_limit;
unsigned int tune_candidate_limit;
unsigned int tune_2partitioning_candidate_limit;
unsigned int tune_3partitioning_candidate_limit;
unsigned int tune_4partitioning_candidate_limit;
float tune_db_limit_a_base;
float tune_db_limit_b_base;
float tune_mse_overshoot;
float tune_2partition_early_out_limit_factor;
float tune_3partition_early_out_limit_factor;
float tune_2plane_early_out_limit_correlation;
};
/**
* @brief The static presets for high bandwidth encodings (x < 25 texels per block).
*/
static const std::array<astcenc_preset_config, 6> preset_configs_high {{
{
ASTCENC_PRE_FASTEST,
2, 10, 6, 4, 43, 2, 2, 2, 2, 2, 85.2f, 63.2f, 3.5f, 1.0f, 1.0f, 0.85f
}, {
ASTCENC_PRE_FAST,
3, 18, 10, 8, 55, 3, 3, 2, 2, 2, 85.2f, 63.2f, 3.5f, 1.0f, 1.0f, 0.90f
}, {
ASTCENC_PRE_MEDIUM,
4, 34, 28, 16, 77, 3, 3, 2, 2, 2, 95.0f, 70.0f, 2.5f, 1.1f, 1.05f, 0.95f
}, {
ASTCENC_PRE_THOROUGH,
4, 82, 60, 30, 94, 4, 4, 3, 2, 2, 105.0f, 77.0f, 10.0f, 1.35f, 1.15f, 0.97f
}, {
ASTCENC_PRE_VERYTHOROUGH,
4, 256, 128, 64, 98, 4, 6, 20, 14, 8, 200.0f, 200.0f, 10.0f, 1.6f, 1.4f, 0.98f
}, {
ASTCENC_PRE_EXHAUSTIVE,
4, 512, 512, 512, 100, 4, 8, 32, 32, 32, 200.0f, 200.0f, 10.0f, 2.0f, 2.0f, 0.99f
}
}};
/**
* @brief The static presets for medium bandwidth encodings (25 <= x < 64 texels per block).
*/
static const std::array<astcenc_preset_config, 6> preset_configs_mid {{
{
ASTCENC_PRE_FASTEST,
2, 10, 6, 4, 43, 2, 2, 2, 2, 2, 85.2f, 63.2f, 3.5f, 1.0f, 1.0f, 0.80f
}, {
ASTCENC_PRE_FAST,
3, 18, 12, 10, 55, 3, 3, 2, 2, 2, 85.2f, 63.2f, 3.5f, 1.0f, 1.0f, 0.85f
}, {
ASTCENC_PRE_MEDIUM,
4, 34, 28, 16, 77, 3, 3, 2, 2, 2, 95.0f, 70.0f, 3.0f, 1.1f, 1.05f, 0.90f
}, {
ASTCENC_PRE_THOROUGH,
4, 82, 60, 30, 94, 4, 4, 3, 2, 2, 105.0f, 77.0f, 10.0f, 1.4f, 1.2f, 0.95f
}, {
ASTCENC_PRE_VERYTHOROUGH,
4, 256, 128, 64, 98, 4, 6, 12, 8, 3, 200.0f, 200.0f, 10.0f, 1.6f, 1.4f, 0.98f
}, {
ASTCENC_PRE_EXHAUSTIVE,
4, 256, 256, 256, 100, 4, 8, 32, 32, 32, 200.0f, 200.0f, 10.0f, 2.0f, 2.0f, 0.99f
}
}};
/**
* @brief The static presets for low bandwidth encodings (64 <= x texels per block).
*/
static const std::array<astcenc_preset_config, 6> preset_configs_low {{
{
ASTCENC_PRE_FASTEST,
2, 10, 6, 4, 40, 2, 2, 2, 2, 2, 85.0f, 63.0f, 3.5f, 1.0f, 1.0f, 0.80f
}, {
ASTCENC_PRE_FAST,
2, 18, 12, 10, 55, 3, 3, 2, 2, 2, 85.0f, 63.0f, 3.5f, 1.0f, 1.0f, 0.85f
}, {
ASTCENC_PRE_MEDIUM,
3, 34, 28, 16, 77, 3, 3, 2, 2, 2, 95.0f, 70.0f, 3.5f, 1.1f, 1.05f, 0.90f
}, {
ASTCENC_PRE_THOROUGH,
4, 82, 60, 30, 93, 4, 4, 3, 2, 2, 105.0f, 77.0f, 10.0f, 1.3f, 1.2f, 0.97f
}, {
ASTCENC_PRE_VERYTHOROUGH,
4, 256, 128, 64, 98, 4, 6, 9, 5, 2, 200.0f, 200.0f, 10.0f, 1.6f, 1.4f, 0.98f
}, {
ASTCENC_PRE_EXHAUSTIVE,
4, 256, 256, 256, 100, 4, 8, 32, 32, 32, 200.0f, 200.0f, 10.0f, 2.0f, 2.0f, 0.99f
}
}};
/**
* @brief Validate CPU floating point meets assumptions made in the codec.
*
* The codec is written with the assumption that a float threaded through the @c if32 union will be
* stored and reloaded as a 32-bit IEEE-754 float with round-to-nearest rounding. This is always the
* case in an IEEE-754 compliant system, however not every system or compilation mode is actually
* IEEE-754 compliant. This normally fails if the code is compiled with fast math enabled.
*
* @return Return @c ASTCENC_SUCCESS if validated, otherwise an error on failure.
*/
static astcenc_error validate_cpu_float()
{
if32 p;
volatile float xprec_testval = 2.51f;
p.f = xprec_testval + 12582912.0f;
float q = p.f - 12582912.0f;
if (q != 3.0f)
{
return ASTCENC_ERR_BAD_CPU_FLOAT;
}
return ASTCENC_SUCCESS;
}
/**
* @brief Validate config profile.
*
* @param profile The profile to check.
*
* @return Return @c ASTCENC_SUCCESS if validated, otherwise an error on failure.
*/
static astcenc_error validate_profile(
astcenc_profile profile
) {
// Values in this enum are from an external user, so not guaranteed to be
// bounded to the enum values
switch (static_cast<int>(profile))
{
case ASTCENC_PRF_LDR_SRGB:
case ASTCENC_PRF_LDR:
case ASTCENC_PRF_HDR_RGB_LDR_A:
case ASTCENC_PRF_HDR:
return ASTCENC_SUCCESS;
default:
return ASTCENC_ERR_BAD_PROFILE;
}
}
/**
* @brief Validate block size.
*
* @param block_x The block x dimensions.
* @param block_y The block y dimensions.
* @param block_z The block z dimensions.
*
* @return Return @c ASTCENC_SUCCESS if validated, otherwise an error on failure.
*/
static astcenc_error validate_block_size(
unsigned int block_x,
unsigned int block_y,
unsigned int block_z
) {
// Test if this is a legal block size at all
bool is_legal = (((block_z <= 1) && is_legal_2d_block_size(block_x, block_y)) ||
((block_z >= 2) && is_legal_3d_block_size(block_x, block_y, block_z)));
if (!is_legal)
{
return ASTCENC_ERR_BAD_BLOCK_SIZE;
}
// Test if this build has sufficient capacity for this block size
bool have_capacity = (block_x * block_y * block_z) <= BLOCK_MAX_TEXELS;
if (!have_capacity)
{
return ASTCENC_ERR_NOT_IMPLEMENTED;
}
return ASTCENC_SUCCESS;
}
/**
* @brief Validate flags.
*
* @param flags The flags to check.
*
* @return Return @c ASTCENC_SUCCESS if validated, otherwise an error on failure.
*/
static astcenc_error validate_flags(
unsigned int flags
) {
// Flags field must not contain any unknown flag bits
unsigned int exMask = ~ASTCENC_ALL_FLAGS;
if (popcount(flags & exMask) != 0)
{
return ASTCENC_ERR_BAD_FLAGS;
}
// Flags field must only contain at most a single map type
exMask = ASTCENC_FLG_MAP_NORMAL
| ASTCENC_FLG_MAP_RGBM;
if (popcount(flags & exMask) > 1)
{
return ASTCENC_ERR_BAD_FLAGS;
}
return ASTCENC_SUCCESS;
}
#if !defined(ASTCENC_DECOMPRESS_ONLY)
/**
* @brief Validate single channel compression swizzle.
*
* @param swizzle The swizzle to check.
*
* @return Return @c ASTCENC_SUCCESS if validated, otherwise an error on failure.
*/
static astcenc_error validate_compression_swz(
astcenc_swz swizzle
) {
// Not all enum values are handled; SWZ_Z is invalid for compression
switch (static_cast<int>(swizzle))
{
case ASTCENC_SWZ_R:
case ASTCENC_SWZ_G:
case ASTCENC_SWZ_B:
case ASTCENC_SWZ_A:
case ASTCENC_SWZ_0:
case ASTCENC_SWZ_1:
return ASTCENC_SUCCESS;
default:
return ASTCENC_ERR_BAD_SWIZZLE;
}
}
/**
* @brief Validate overall compression swizzle.
*
* @param swizzle The swizzle to check.
*
* @return Return @c ASTCENC_SUCCESS if validated, otherwise an error on failure.
*/
static astcenc_error validate_compression_swizzle(
const astcenc_swizzle& swizzle
) {
if (validate_compression_swz(swizzle.r) ||
validate_compression_swz(swizzle.g) ||
validate_compression_swz(swizzle.b) ||
validate_compression_swz(swizzle.a))
{
return ASTCENC_ERR_BAD_SWIZZLE;
}
return ASTCENC_SUCCESS;
}
#endif
/**
* @brief Validate single channel decompression swizzle.
*
* @param swizzle The swizzle to check.
*
* @return Return @c ASTCENC_SUCCESS if validated, otherwise an error on failure.
*/
static astcenc_error validate_decompression_swz(
astcenc_swz swizzle
) {
// Values in this enum are from an external user, so not guaranteed to be
// bounded to the enum values
switch (static_cast<int>(swizzle))
{
case ASTCENC_SWZ_R:
case ASTCENC_SWZ_G:
case ASTCENC_SWZ_B:
case ASTCENC_SWZ_A:
case ASTCENC_SWZ_0:
case ASTCENC_SWZ_1:
case ASTCENC_SWZ_Z:
return ASTCENC_SUCCESS;
default:
return ASTCENC_ERR_BAD_SWIZZLE;
}
}
/**
* @brief Validate overall decompression swizzle.
*
* @param swizzle The swizzle to check.
*
* @return Return @c ASTCENC_SUCCESS if validated, otherwise an error on failure.
*/
static astcenc_error validate_decompression_swizzle(
const astcenc_swizzle& swizzle
) {
if (validate_decompression_swz(swizzle.r) ||
validate_decompression_swz(swizzle.g) ||
validate_decompression_swz(swizzle.b) ||
validate_decompression_swz(swizzle.a))
{
return ASTCENC_ERR_BAD_SWIZZLE;
}
return ASTCENC_SUCCESS;
}
/**
* Validate that an incoming configuration is in-spec.
*
* This function can respond in two ways:
*
* * Numerical inputs that have valid ranges are clamped to those valid ranges. No error is thrown
* for out-of-range inputs in this case.
* * Numerical inputs and logic inputs are are logically invalid and which make no sense
* algorithmically will return an error.
*
* @param[in,out] config The input compressor configuration.
*
* @return Return @c ASTCENC_SUCCESS if validated, otherwise an error on failure.
*/
static astcenc_error validate_config(
astcenc_config &config
) {
astcenc_error status;
status = validate_profile(config.profile);
if (status != ASTCENC_SUCCESS)
{
return status;
}
status = validate_flags(config.flags);
if (status != ASTCENC_SUCCESS)
{
return status;
}
status = validate_block_size(config.block_x, config.block_y, config.block_z);
if (status != ASTCENC_SUCCESS)
{
return status;
}
#if defined(ASTCENC_DECOMPRESS_ONLY)
// Decompress-only builds only support decompress-only contexts
if (!(config.flags & ASTCENC_FLG_DECOMPRESS_ONLY))
{
return ASTCENC_ERR_BAD_PARAM;
}
#endif
config.rgbm_m_scale = astc::max(config.rgbm_m_scale, 1.0f);
config.tune_partition_count_limit = astc::clamp(config.tune_partition_count_limit, 1u, 4u);
config.tune_2partition_index_limit = astc::clamp(config.tune_2partition_index_limit, 1u, BLOCK_MAX_PARTITIONINGS);
config.tune_3partition_index_limit = astc::clamp(config.tune_3partition_index_limit, 1u, BLOCK_MAX_PARTITIONINGS);
config.tune_4partition_index_limit = astc::clamp(config.tune_4partition_index_limit, 1u, BLOCK_MAX_PARTITIONINGS);
config.tune_block_mode_limit = astc::clamp(config.tune_block_mode_limit, 1u, 100u);
config.tune_refinement_limit = astc::max(config.tune_refinement_limit, 1u);
config.tune_candidate_limit = astc::clamp(config.tune_candidate_limit, 1u, TUNE_MAX_TRIAL_CANDIDATES);
config.tune_2partitioning_candidate_limit = astc::clamp(config.tune_2partitioning_candidate_limit, 1u, TUNE_MAX_PARTITIONING_CANDIDATES);
config.tune_3partitioning_candidate_limit = astc::clamp(config.tune_3partitioning_candidate_limit, 1u, TUNE_MAX_PARTITIONING_CANDIDATES);
config.tune_4partitioning_candidate_limit = astc::clamp(config.tune_4partitioning_candidate_limit, 1u, TUNE_MAX_PARTITIONING_CANDIDATES);
config.tune_db_limit = astc::max(config.tune_db_limit, 0.0f);
config.tune_mse_overshoot = astc::max(config.tune_mse_overshoot, 1.0f);
config.tune_2partition_early_out_limit_factor = astc::max(config.tune_2partition_early_out_limit_factor, 0.0f);
config.tune_3partition_early_out_limit_factor = astc::max(config.tune_3partition_early_out_limit_factor, 0.0f);
config.tune_2plane_early_out_limit_correlation = astc::max(config.tune_2plane_early_out_limit_correlation, 0.0f);
// Specifying a zero weight color component is not allowed; force to small value
float max_weight = astc::max(astc::max(config.cw_r_weight, config.cw_g_weight),
astc::max(config.cw_b_weight, config.cw_a_weight));
if (max_weight > 0.0f)
{
max_weight /= 1000.0f;
config.cw_r_weight = astc::max(config.cw_r_weight, max_weight);
config.cw_g_weight = astc::max(config.cw_g_weight, max_weight);
config.cw_b_weight = astc::max(config.cw_b_weight, max_weight);
config.cw_a_weight = astc::max(config.cw_a_weight, max_weight);
}
// If all color components error weights are zero then return an error
else
{
return ASTCENC_ERR_BAD_PARAM;
}
return ASTCENC_SUCCESS;
}
/* See header for documentation. */
astcenc_error astcenc_config_init(
astcenc_profile profile,
unsigned int block_x,
unsigned int block_y,
unsigned int block_z,
float quality,
unsigned int flags,
astcenc_config* configp
) {
astcenc_error status;
status = validate_cpu_float();
if (status != ASTCENC_SUCCESS)
{
return status;
}
// Zero init all config fields; although most of will be over written
astcenc_config& config = *configp;
std::memset(&config, 0, sizeof(config));
// Process the block size
block_z = astc::max(block_z, 1u); // For 2D blocks Z==0 is accepted, but convert to 1
status = validate_block_size(block_x, block_y, block_z);
if (status != ASTCENC_SUCCESS)
{
return status;
}
config.block_x = block_x;
config.block_y = block_y;
config.block_z = block_z;
float texels = static_cast<float>(block_x * block_y * block_z);
float ltexels = logf(texels) / logf(10.0f);
// Process the performance quality level or preset; note that this must be done before we
// process any additional settings, such as color profile and flags, which may replace some of
// these settings with more use case tuned values
if (quality < ASTCENC_PRE_FASTEST ||
quality > ASTCENC_PRE_EXHAUSTIVE)
{
return ASTCENC_ERR_BAD_QUALITY;
}
static const std::array<astcenc_preset_config, 6>* preset_configs;
int texels_int = block_x * block_y * block_z;
if (texels_int < 25)
{
preset_configs = &preset_configs_high;
}
else if (texels_int < 64)
{
preset_configs = &preset_configs_mid;
}
else
{
preset_configs = &preset_configs_low;
}
// Determine which preset to use, or which pair to interpolate
size_t start;
size_t end;
for (end = 0; end < preset_configs->size(); end++)
{
if ((*preset_configs)[end].quality >= quality)
{
break;
}
}
start = end == 0 ? 0 : end - 1;
// Start and end node are the same - so just transfer the values.
if (start == end)
{
config.tune_partition_count_limit = (*preset_configs)[start].tune_partition_count_limit;
config.tune_2partition_index_limit = (*preset_configs)[start].tune_2partition_index_limit;
config.tune_3partition_index_limit = (*preset_configs)[start].tune_3partition_index_limit;
config.tune_4partition_index_limit = (*preset_configs)[start].tune_4partition_index_limit;
config.tune_block_mode_limit = (*preset_configs)[start].tune_block_mode_limit;
config.tune_refinement_limit = (*preset_configs)[start].tune_refinement_limit;
config.tune_candidate_limit = astc::min((*preset_configs)[start].tune_candidate_limit, TUNE_MAX_TRIAL_CANDIDATES);
config.tune_2partitioning_candidate_limit = astc::min((*preset_configs)[start].tune_2partitioning_candidate_limit, TUNE_MAX_PARTITIONING_CANDIDATES);
config.tune_3partitioning_candidate_limit = astc::min((*preset_configs)[start].tune_3partitioning_candidate_limit, TUNE_MAX_PARTITIONING_CANDIDATES);
config.tune_4partitioning_candidate_limit = astc::min((*preset_configs)[start].tune_4partitioning_candidate_limit, TUNE_MAX_PARTITIONING_CANDIDATES);
config.tune_db_limit = astc::max((*preset_configs)[start].tune_db_limit_a_base - 35 * ltexels,
(*preset_configs)[start].tune_db_limit_b_base - 19 * ltexels);
config.tune_mse_overshoot = (*preset_configs)[start].tune_mse_overshoot;
config.tune_2partition_early_out_limit_factor = (*preset_configs)[start].tune_2partition_early_out_limit_factor;
config.tune_3partition_early_out_limit_factor = (*preset_configs)[start].tune_3partition_early_out_limit_factor;
config.tune_2plane_early_out_limit_correlation = (*preset_configs)[start].tune_2plane_early_out_limit_correlation;
}
// Start and end node are not the same - so interpolate between them
else
{
auto& node_a = (*preset_configs)[start];
auto& node_b = (*preset_configs)[end];
float wt_range = node_b.quality - node_a.quality;
assert(wt_range > 0);
// Compute interpolation factors
float wt_node_a = (node_b.quality - quality) / wt_range;
float wt_node_b = (quality - node_a.quality) / wt_range;
#define LERP(param) ((node_a.param * wt_node_a) + (node_b.param * wt_node_b))
#define LERPI(param) astc::flt2int_rtn(\
(static_cast<float>(node_a.param) * wt_node_a) + \
(static_cast<float>(node_b.param) * wt_node_b))
#define LERPUI(param) static_cast<unsigned int>(LERPI(param))
config.tune_partition_count_limit = LERPI(tune_partition_count_limit);
config.tune_2partition_index_limit = LERPI(tune_2partition_index_limit);
config.tune_3partition_index_limit = LERPI(tune_3partition_index_limit);
config.tune_4partition_index_limit = LERPI(tune_4partition_index_limit);
config.tune_block_mode_limit = LERPI(tune_block_mode_limit);
config.tune_refinement_limit = LERPI(tune_refinement_limit);
config.tune_candidate_limit = astc::min(LERPUI(tune_candidate_limit),
TUNE_MAX_TRIAL_CANDIDATES);
config.tune_2partitioning_candidate_limit = astc::min(LERPUI(tune_2partitioning_candidate_limit),
BLOCK_MAX_PARTITIONINGS);
config.tune_3partitioning_candidate_limit = astc::min(LERPUI(tune_3partitioning_candidate_limit),
BLOCK_MAX_PARTITIONINGS);
config.tune_4partitioning_candidate_limit = astc::min(LERPUI(tune_4partitioning_candidate_limit),
BLOCK_MAX_PARTITIONINGS);
config.tune_db_limit = astc::max(LERP(tune_db_limit_a_base) - 35 * ltexels,
LERP(tune_db_limit_b_base) - 19 * ltexels);
config.tune_mse_overshoot = LERP(tune_mse_overshoot);
config.tune_2partition_early_out_limit_factor = LERP(tune_2partition_early_out_limit_factor);
config.tune_3partition_early_out_limit_factor = LERP(tune_3partition_early_out_limit_factor);
config.tune_2plane_early_out_limit_correlation = LERP(tune_2plane_early_out_limit_correlation);
#undef LERP
#undef LERPI
#undef LERPUI
}
// Set heuristics to the defaults for each color profile
config.cw_r_weight = 1.0f;
config.cw_g_weight = 1.0f;
config.cw_b_weight = 1.0f;
config.cw_a_weight = 1.0f;
config.a_scale_radius = 0;
config.rgbm_m_scale = 0.0f;
config.profile = profile;
// Values in this enum are from an external user, so not guaranteed to be
// bounded to the enum values
switch (static_cast<int>(profile))
{
case ASTCENC_PRF_LDR:
case ASTCENC_PRF_LDR_SRGB:
break;
case ASTCENC_PRF_HDR_RGB_LDR_A:
case ASTCENC_PRF_HDR:
config.tune_db_limit = 999.0f;
break;
default:
return ASTCENC_ERR_BAD_PROFILE;
}
// Flags field must not contain any unknown flag bits
status = validate_flags(flags);
if (status != ASTCENC_SUCCESS)
{
return status;
}
if (flags & ASTCENC_FLG_MAP_NORMAL)
{
// Normal map encoding uses L+A blocks, so allow one more partitioning
// than normal. We need need fewer bits for endpoints, so more likely
// to be able to use more partitions than an RGB/RGBA block
config.tune_partition_count_limit = astc::min(config.tune_partition_count_limit + 1u, 4u);
config.cw_g_weight = 0.0f;
config.cw_b_weight = 0.0f;
config.tune_2partition_early_out_limit_factor *= 1.5f;
config.tune_3partition_early_out_limit_factor *= 1.5f;
config.tune_2plane_early_out_limit_correlation = 0.99f;
// Normals are prone to blocking artifacts on smooth curves
// so force compressor to try harder here ...
config.tune_db_limit *= 1.03f;
}
else if (flags & ASTCENC_FLG_MAP_RGBM)
{
config.rgbm_m_scale = 5.0f;
config.cw_a_weight = 2.0f * config.rgbm_m_scale;
}
else // (This is color data)
{
// This is a very basic perceptual metric for RGB color data, which weights error
// significance by the perceptual luminance contribution of each color channel. For
// luminance the usual weights to compute luminance from a linear RGB value are as
// follows:
//
// l = r * 0.3 + g * 0.59 + b * 0.11
//
// ... but we scale these up to keep a better balance between color and alpha. Note
// that if the content is using alpha we'd recommend using the -a option to weight
// the color contribution by the alpha transparency.
if (flags & ASTCENC_FLG_USE_PERCEPTUAL)
{
config.cw_r_weight = 0.30f * 2.25f;
config.cw_g_weight = 0.59f * 2.25f;
config.cw_b_weight = 0.11f * 2.25f;
}
}
config.flags = flags;
return ASTCENC_SUCCESS;
}
/* See header for documentation. */
astcenc_error astcenc_context_alloc(
const astcenc_config* configp,
unsigned int thread_count,
astcenc_context** context
) {
astcenc_error status;
const astcenc_config& config = *configp;
status = validate_cpu_float();
if (status != ASTCENC_SUCCESS)
{
return status;
}
if (thread_count == 0)
{
return ASTCENC_ERR_BAD_PARAM;
}
#if defined(ASTCENC_DIAGNOSTICS)
// Force single threaded compressor use in diagnostic mode.
if (thread_count != 1)
{
return ASTCENC_ERR_BAD_PARAM;
}
#endif
astcenc_context* ctxo = new astcenc_context;
astcenc_contexti* ctx = &ctxo->context;
ctx->thread_count = thread_count;
ctx->config = config;
ctx->working_buffers = nullptr;
// These are allocated per-compress, as they depend on image size
ctx->input_alpha_averages = nullptr;
// Copy the config first and validate the copy (we may modify it)
status = validate_config(ctx->config);
if (status != ASTCENC_SUCCESS)
{
delete ctxo;
return status;
}
ctx->bsd = aligned_malloc<block_size_descriptor>(sizeof(block_size_descriptor), ASTCENC_VECALIGN);
bool can_omit_modes = static_cast<bool>(config.flags & ASTCENC_FLG_SELF_DECOMPRESS_ONLY);
init_block_size_descriptor(config.block_x, config.block_y, config.block_z,
can_omit_modes,
config.tune_partition_count_limit,
static_cast<float>(config.tune_block_mode_limit) / 100.0f,
*ctx->bsd);
#if !defined(ASTCENC_DECOMPRESS_ONLY)
// Do setup only needed by compression
if (!(status & ASTCENC_FLG_DECOMPRESS_ONLY))
{
// Turn a dB limit into a per-texel error for faster use later
if ((ctx->config.profile == ASTCENC_PRF_LDR) || (ctx->config.profile == ASTCENC_PRF_LDR_SRGB))
{
ctx->config.tune_db_limit = astc::pow(0.1f, ctx->config.tune_db_limit * 0.1f) * 65535.0f * 65535.0f;
}
else
{
ctx->config.tune_db_limit = 0.0f;
}
size_t worksize = sizeof(compression_working_buffers) * thread_count;
ctx->working_buffers = aligned_malloc<compression_working_buffers>(worksize, ASTCENC_VECALIGN);
static_assert((sizeof(compression_working_buffers) % ASTCENC_VECALIGN) == 0,
"compression_working_buffers size must be multiple of vector alignment");
if (!ctx->working_buffers)
{
aligned_free<block_size_descriptor>(ctx->bsd);
delete ctxo;
*context = nullptr;
return ASTCENC_ERR_OUT_OF_MEM;
}
}
#endif
#if defined(ASTCENC_DIAGNOSTICS)
ctx->trace_log = new TraceLog(ctx->config.trace_file_path);
if (!ctx->trace_log->m_file)
{
return ASTCENC_ERR_DTRACE_FAILURE;
}
trace_add_data("block_x", config.block_x);
trace_add_data("block_y", config.block_y);
trace_add_data("block_z", config.block_z);
#endif
*context = ctxo;
#if !defined(ASTCENC_DECOMPRESS_ONLY)
prepare_angular_tables();
#endif
return ASTCENC_SUCCESS;
}
/* See header dor documentation. */
void astcenc_context_free(
astcenc_context* ctxo
) {
if (ctxo)
{
astcenc_contexti* ctx = &ctxo->context;
aligned_free<compression_working_buffers>(ctx->working_buffers);
aligned_free<block_size_descriptor>(ctx->bsd);
#if defined(ASTCENC_DIAGNOSTICS)
delete ctx->trace_log;
#endif
delete ctxo;
}
}
#if !defined(ASTCENC_DECOMPRESS_ONLY)
/**
* @brief Compress an image, after any preflight has completed.
*
* @param[out] ctxo The compressor context.
* @param thread_index The thread index.
* @param image The intput image.
* @param swizzle The input swizzle.
* @param[out] buffer The output array for the compressed data.
*/
static void compress_image(
astcenc_context& ctxo,
unsigned int thread_index,
const astcenc_image& image,
const astcenc_swizzle& swizzle,
uint8_t* buffer
) {
astcenc_contexti& ctx = ctxo.context;
const block_size_descriptor& bsd = *ctx.bsd;
astcenc_profile decode_mode = ctx.config.profile;
image_block blk;
int block_x = bsd.xdim;
int block_y = bsd.ydim;
int block_z = bsd.zdim;
blk.texel_count = static_cast<uint8_t>(block_x * block_y * block_z);
int dim_x = image.dim_x;
int dim_y = image.dim_y;
int dim_z = image.dim_z;
int xblocks = (dim_x + block_x - 1) / block_x;
int yblocks = (dim_y + block_y - 1) / block_y;
int zblocks = (dim_z + block_z - 1) / block_z;
int block_count = zblocks * yblocks * xblocks;
int row_blocks = xblocks;
int plane_blocks = xblocks * yblocks;
// Populate the block channel weights
blk.channel_weight = vfloat4(ctx.config.cw_r_weight,
ctx.config.cw_g_weight,
ctx.config.cw_b_weight,
ctx.config.cw_a_weight);
// Use preallocated scratch buffer
auto& temp_buffers = ctx.working_buffers[thread_index];
// Only the first thread actually runs the initializer
ctxo.manage_compress.init(block_count);
// Determine if we can use an optimized load function
bool needs_swz = (swizzle.r != ASTCENC_SWZ_R) || (swizzle.g != ASTCENC_SWZ_G) ||
(swizzle.b != ASTCENC_SWZ_B) || (swizzle.a != ASTCENC_SWZ_A);
bool needs_hdr = (decode_mode == ASTCENC_PRF_HDR) ||
(decode_mode == ASTCENC_PRF_HDR_RGB_LDR_A);
bool use_fast_load = !needs_swz && !needs_hdr &&
block_z == 1 && image.data_type == ASTCENC_TYPE_U8;
auto load_func = load_image_block;
if (use_fast_load)
{
load_func = load_image_block_fast_ldr;
}
// All threads run this processing loop until there is no work remaining
while (true)
{
unsigned int count;
unsigned int base = ctxo.manage_compress.get_task_assignment(16, count);
if (!count)
{
break;
}
for (unsigned int i = base; i < base + count; i++)
{
// Decode i into x, y, z block indices
int z = i / plane_blocks;
unsigned int rem = i - (z * plane_blocks);
int y = rem / row_blocks;
int x = rem - (y * row_blocks);
// Test if we can apply some basic alpha-scale RDO
bool use_full_block = true;
if (ctx.config.a_scale_radius != 0 && block_z == 1)
{
int start_x = x * block_x;
int end_x = astc::min(dim_x, start_x + block_x);
int start_y = y * block_y;
int end_y = astc::min(dim_y, start_y + block_y);
// SATs accumulate error, so don't test exactly zero. Test for
// less than 1 alpha in the expanded block footprint that
// includes the alpha radius.
int x_footprint = block_x + 2 * (ctx.config.a_scale_radius - 1);
int y_footprint = block_y + 2 * (ctx.config.a_scale_radius - 1);
float footprint = static_cast<float>(x_footprint * y_footprint);
float threshold = 0.9f / (255.0f * footprint);
// Do we have any alpha values?
use_full_block = false;
for (int ay = start_y; ay < end_y; ay++)
{
for (int ax = start_x; ax < end_x; ax++)
{
float a_avg = ctx.input_alpha_averages[ay * dim_x + ax];
if (a_avg > threshold)
{
use_full_block = true;
ax = end_x;
ay = end_y;
}
}
}
}
// Fetch the full block for compression
if (use_full_block)
{
load_func(decode_mode, image, blk, bsd, x * block_x, y * block_y, z * block_z, swizzle);
// Scale RGB error contribution by the maximum alpha in the block
// This encourages preserving alpha accuracy in regions with high
// transparency, and can buy up to 0.5 dB PSNR.
if (ctx.config.flags & ASTCENC_FLG_USE_ALPHA_WEIGHT)
{
float alpha_scale = blk.data_max.lane<3>() * (1.0f / 65535.0f);
blk.channel_weight = vfloat4(ctx.config.cw_r_weight * alpha_scale,
ctx.config.cw_g_weight * alpha_scale,
ctx.config.cw_b_weight * alpha_scale,
ctx.config.cw_a_weight);
}
}
// Apply alpha scale RDO - substitute constant color block
else
{
blk.origin_texel = vfloat4::zero();
blk.data_min = vfloat4::zero();
blk.data_mean = vfloat4::zero();
blk.data_max = vfloat4::zero();
blk.grayscale = true;
}
int offset = ((z * yblocks + y) * xblocks + x) * 16;
uint8_t *bp = buffer + offset;
physical_compressed_block* pcb = reinterpret_cast<physical_compressed_block*>(bp);
compress_block(ctx, blk, *pcb, temp_buffers);
}
ctxo.manage_compress.complete_task_assignment(count);
}
}
/**
* @brief Compute regional averages in an image.
*
* This function can be called by multiple threads, but only after a single
* thread calls the setup function @c init_compute_averages().
*
* Results are written back into @c img->input_alpha_averages.
*
* @param[out] ctx The context.
* @param ag The average and variance arguments created during setup.
*/
static void compute_averages(
astcenc_context& ctx,
const avg_args &ag
) {
pixel_region_args arg = ag.arg;
arg.work_memory = new vfloat4[ag.work_memory_size];
int size_x = ag.img_size_x;
int size_y = ag.img_size_y;
int size_z = ag.img_size_z;
int step_xy = ag.blk_size_xy;
int step_z = ag.blk_size_z;
int y_tasks = (size_y + step_xy - 1) / step_xy;
// All threads run this processing loop until there is no work remaining
while (true)
{
unsigned int count;
unsigned int base = ctx.manage_avg.get_task_assignment(16, count);
if (!count)
{
break;
}
for (unsigned int i = base; i < base + count; i++)
{
int z = (i / (y_tasks)) * step_z;
int y = (i - (z * y_tasks)) * step_xy;
arg.size_z = astc::min(step_z, size_z - z);
arg.offset_z = z;
arg.size_y = astc::min(step_xy, size_y - y);
arg.offset_y = y;
for (int x = 0; x < size_x; x += step_xy)
{
arg.size_x = astc::min(step_xy, size_x - x);
arg.offset_x = x;
compute_pixel_region_variance(ctx.context, arg);
}
}
ctx.manage_avg.complete_task_assignment(count);
}
delete[] arg.work_memory;
}
#endif
/* See header for documentation. */
astcenc_error astcenc_compress_image(
astcenc_context* ctxo,
astcenc_image* imagep,
const astcenc_swizzle* swizzle,
uint8_t* data_out,
size_t data_len,
unsigned int thread_index
) {
#if defined(ASTCENC_DECOMPRESS_ONLY)
(void)ctxo;
(void)imagep;
(void)swizzle;
(void)data_out;
(void)data_len;
(void)thread_index;
return ASTCENC_ERR_BAD_CONTEXT;
#else
astcenc_contexti* ctx = &ctxo->context;
astcenc_error status;
astcenc_image& image = *imagep;
if (ctx->config.flags & ASTCENC_FLG_DECOMPRESS_ONLY)
{
return ASTCENC_ERR_BAD_CONTEXT;
}
status = validate_compression_swizzle(*swizzle);
if (status != ASTCENC_SUCCESS)
{
return status;
}
if (thread_index >= ctx->thread_count)
{
return ASTCENC_ERR_BAD_PARAM;
}
unsigned int block_x = ctx->config.block_x;
unsigned int block_y = ctx->config.block_y;
unsigned int block_z = ctx->config.block_z;
unsigned int xblocks = (image.dim_x + block_x - 1) / block_x;
unsigned int yblocks = (image.dim_y + block_y - 1) / block_y;
unsigned int zblocks = (image.dim_z + block_z - 1) / block_z;
// Check we have enough output space (16 bytes per block)
size_t size_needed = xblocks * yblocks * zblocks * 16;
if (data_len < size_needed)
{
return ASTCENC_ERR_OUT_OF_MEM;
}
// If context thread count is one then implicitly reset
if (ctx->thread_count == 1)
{
astcenc_compress_reset(ctxo);
}
if (ctx->config.a_scale_radius != 0)
{
// First thread to enter will do setup, other threads will subsequently
// enter the critical section but simply skip over the initialization
auto init_avg = [ctx, &image, swizzle]() {
// Perform memory allocations for the destination buffers
size_t texel_count = image.dim_x * image.dim_y * image.dim_z;
ctx->input_alpha_averages = new float[texel_count];
return init_compute_averages(
image, ctx->config.a_scale_radius, *swizzle,
ctx->avg_preprocess_args);
};
// Only the first thread actually runs the initializer
ctxo->manage_avg.init(init_avg);
// All threads will enter this function and dynamically grab work
compute_averages(*ctxo, ctx->avg_preprocess_args);
}
// Wait for compute_averages to complete before compressing
ctxo->manage_avg.wait();
compress_image(*ctxo, thread_index, image, *swizzle, data_out);
// Wait for compress to complete before freeing memory
ctxo->manage_compress.wait();
auto term_compress = [ctx]() {
delete[] ctx->input_alpha_averages;
ctx->input_alpha_averages = nullptr;
};
// Only the first thread to arrive actually runs the term
ctxo->manage_compress.term(term_compress);
return ASTCENC_SUCCESS;
#endif
}
/* See header for documentation. */
astcenc_error astcenc_compress_reset(
astcenc_context* ctxo
) {
#if defined(ASTCENC_DECOMPRESS_ONLY)
(void)ctxo;
return ASTCENC_ERR_BAD_CONTEXT;
#else
astcenc_contexti* ctx = &ctxo->context;
if (ctx->config.flags & ASTCENC_FLG_DECOMPRESS_ONLY)
{
return ASTCENC_ERR_BAD_CONTEXT;
}
ctxo->manage_avg.reset();
ctxo->manage_compress.reset();
return ASTCENC_SUCCESS;
#endif
}
/* See header for documentation. */
astcenc_error astcenc_decompress_image(
astcenc_context* ctxo,
const uint8_t* data,
size_t data_len,
astcenc_image* image_outp,
const astcenc_swizzle* swizzle,
unsigned int thread_index
) {
astcenc_error status;
astcenc_image& image_out = *image_outp;
astcenc_contexti* ctx = &ctxo->context;
// Today this doesn't matter (working set on stack) but might in future ...
if (thread_index >= ctx->thread_count)
{
return ASTCENC_ERR_BAD_PARAM;
}
status = validate_decompression_swizzle(*swizzle);
if (status != ASTCENC_SUCCESS)
{
return status;
}
unsigned int block_x = ctx->config.block_x;
unsigned int block_y = ctx->config.block_y;
unsigned int block_z = ctx->config.block_z;
unsigned int xblocks = (image_out.dim_x + block_x - 1) / block_x;
unsigned int yblocks = (image_out.dim_y + block_y - 1) / block_y;
unsigned int zblocks = (image_out.dim_z + block_z - 1) / block_z;
int row_blocks = xblocks;
int plane_blocks = xblocks * yblocks;
// Check we have enough output space (16 bytes per block)
size_t size_needed = xblocks * yblocks * zblocks * 16;
if (data_len < size_needed)
{
return ASTCENC_ERR_OUT_OF_MEM;
}
image_block blk;
blk.texel_count = static_cast<uint8_t>(block_x * block_y * block_z);
// If context thread count is one then implicitly reset
if (ctx->thread_count == 1)
{
astcenc_decompress_reset(ctxo);
}
// Only the first thread actually runs the initializer
ctxo->manage_decompress.init(zblocks * yblocks * xblocks);
// All threads run this processing loop until there is no work remaining
while (true)
{
unsigned int count;
unsigned int base = ctxo->manage_decompress.get_task_assignment(128, count);
if (!count)
{
break;
}
for (unsigned int i = base; i < base + count; i++)
{
// Decode i into x, y, z block indices
int z = i / plane_blocks;
unsigned int rem = i - (z * plane_blocks);
int y = rem / row_blocks;
int x = rem - (y * row_blocks);
unsigned int offset = (((z * yblocks + y) * xblocks) + x) * 16;
const uint8_t* bp = data + offset;
const physical_compressed_block& pcb = *reinterpret_cast<const physical_compressed_block*>(bp);
symbolic_compressed_block scb;
physical_to_symbolic(*ctx->bsd, pcb, scb);
decompress_symbolic_block(ctx->config.profile, *ctx->bsd,
x * block_x, y * block_y, z * block_z,
scb, blk);
store_image_block(image_out, blk, *ctx->bsd,
x * block_x, y * block_y, z * block_z, *swizzle);
}
ctxo->manage_decompress.complete_task_assignment(count);
}
return ASTCENC_SUCCESS;
}
/* See header for documentation. */
astcenc_error astcenc_decompress_reset(
astcenc_context* ctxo
) {
ctxo->manage_decompress.reset();
return ASTCENC_SUCCESS;
}
/* See header for documentation. */
astcenc_error astcenc_get_block_info(
astcenc_context* ctxo,
const uint8_t data[16],
astcenc_block_info* info
) {
#if defined(ASTCENC_DECOMPRESS_ONLY)
(void)ctxo;
(void)data;
(void)info;
return ASTCENC_ERR_BAD_CONTEXT;
#else
astcenc_contexti* ctx = &ctxo->context;
// Decode the compressed data into a symbolic form
const physical_compressed_block&pcb = *reinterpret_cast<const physical_compressed_block*>(data);
symbolic_compressed_block scb;
physical_to_symbolic(*ctx->bsd, pcb, scb);
// Fetch the appropriate partition and decimation tables
block_size_descriptor& bsd = *ctx->bsd;
// Start from a clean slate
memset(info, 0, sizeof(*info));
// Basic info we can always populate
info->profile = ctx->config.profile;
info->block_x = ctx->config.block_x;
info->block_y = ctx->config.block_y;
info->block_z = ctx->config.block_z;
info->texel_count = bsd.texel_count;
// Check for error blocks first
info->is_error_block = scb.block_type == SYM_BTYPE_ERROR;
if (info->is_error_block)
{
return ASTCENC_SUCCESS;
}
// Check for constant color blocks second
info->is_constant_block = scb.block_type == SYM_BTYPE_CONST_F16 ||
scb.block_type == SYM_BTYPE_CONST_U16;
if (info->is_constant_block)
{
return ASTCENC_SUCCESS;
}
// Otherwise handle a full block ; known to be valid after conditions above have been checked
int partition_count = scb.partition_count;
const auto& pi = bsd.get_partition_info(partition_count, scb.partition_index);
const block_mode& bm = bsd.get_block_mode(scb.block_mode);
const decimation_info& di = bsd.get_decimation_info(bm.decimation_mode);
info->weight_x = di.weight_x;
info->weight_y = di.weight_y;
info->weight_z = di.weight_z;
info->is_dual_plane_block = bm.is_dual_plane != 0;
info->partition_count = scb.partition_count;
info->partition_index = scb.partition_index;
info->dual_plane_component = scb.plane2_component;
info->color_level_count = get_quant_level(scb.get_color_quant_mode());
info->weight_level_count = get_quant_level(bm.get_weight_quant_mode());
// Unpack color endpoints for each active partition
for (unsigned int i = 0; i < scb.partition_count; i++)
{
bool rgb_hdr;
bool a_hdr;
vint4 endpnt[2];
unpack_color_endpoints(ctx->config.profile,
scb.color_formats[i],
scb.color_values[i],
rgb_hdr, a_hdr,
endpnt[0], endpnt[1]);
// Store the color endpoint mode info
info->color_endpoint_modes[i] = scb.color_formats[i];
info->is_hdr_block = info->is_hdr_block || rgb_hdr || a_hdr;
// Store the unpacked and decoded color endpoint
vmask4 hdr_mask(rgb_hdr, rgb_hdr, rgb_hdr, a_hdr);
for (int j = 0; j < 2; j++)
{
vint4 color_lns = lns_to_sf16(endpnt[j]);
vint4 color_unorm = unorm16_to_sf16(endpnt[j]);
vint4 datai = select(color_unorm, color_lns, hdr_mask);
store(float16_to_float(datai), info->color_endpoints[i][j]);
}
}
// Unpack weights for each texel
int weight_plane1[BLOCK_MAX_TEXELS];
int weight_plane2[BLOCK_MAX_TEXELS];
unpack_weights(bsd, scb, di, bm.is_dual_plane, weight_plane1, weight_plane2);
for (unsigned int i = 0; i < bsd.texel_count; i++)
{
info->weight_values_plane1[i] = static_cast<float>(weight_plane1[i]) * (1.0f / WEIGHTS_TEXEL_SUM);
if (info->is_dual_plane_block)
{
info->weight_values_plane2[i] = static_cast<float>(weight_plane2[i]) * (1.0f / WEIGHTS_TEXEL_SUM);
}
}
// Unpack partition assignments for each texel
for (unsigned int i = 0; i < bsd.texel_count; i++)
{
info->partition_assignment[i] = pi.partition_of_texel[i];
}
return ASTCENC_SUCCESS;
#endif
}
/* See header for documentation. */
const char* astcenc_get_error_string(
astcenc_error status
) {
// Values in this enum are from an external user, so not guaranteed to be
// bounded to the enum values
switch (static_cast<int>(status))
{
case ASTCENC_SUCCESS:
return "ASTCENC_SUCCESS";
case ASTCENC_ERR_OUT_OF_MEM:
return "ASTCENC_ERR_OUT_OF_MEM";
case ASTCENC_ERR_BAD_CPU_FLOAT:
return "ASTCENC_ERR_BAD_CPU_FLOAT";
case ASTCENC_ERR_BAD_PARAM:
return "ASTCENC_ERR_BAD_PARAM";
case ASTCENC_ERR_BAD_BLOCK_SIZE:
return "ASTCENC_ERR_BAD_BLOCK_SIZE";
case ASTCENC_ERR_BAD_PROFILE:
return "ASTCENC_ERR_BAD_PROFILE";
case ASTCENC_ERR_BAD_QUALITY:
return "ASTCENC_ERR_BAD_QUALITY";
case ASTCENC_ERR_BAD_FLAGS:
return "ASTCENC_ERR_BAD_FLAGS";
case ASTCENC_ERR_BAD_SWIZZLE:
return "ASTCENC_ERR_BAD_SWIZZLE";
case ASTCENC_ERR_BAD_CONTEXT:
return "ASTCENC_ERR_BAD_CONTEXT";
case ASTCENC_ERR_NOT_IMPLEMENTED:
return "ASTCENC_ERR_NOT_IMPLEMENTED";
#if defined(ASTCENC_DIAGNOSTICS)
case ASTCENC_ERR_DTRACE_FAILURE:
return "ASTCENC_ERR_DTRACE_FAILURE";
#endif
default:
return nullptr;
}
}
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